Hi There,
We have recently been given a warm freshwater tank and I have a couple of aggresive fish that keep killing any new fish we introduce, Just wanting to find out what they were so that I can maybe get them some females or maybe some males??

I have googled them and I thought that we had a gourami 3 spot and a Melanochromis Johannii, so I went and bought 3 female gourami's and got them home and they dont look the same at all. I know that males look different but they dont even have the same fin structure.

So I have attached a picture of each of them and Im hoping someone can help.

Not surprising, that. Both are cichlids, the latter is as you correctly identified a Melanochromis johannii, and the first is Hemichromis bimaculatus, commonly called the Jewel Cichlid. This one is in our profiles, click the shaded name for info.

Both are aggressive fish. The blue is a rift lake cichlid, that should only be kept with other rift lake fish in largish tanks. We have some cichlid experts here who can add to this generality.

The Jewel should be in a 4-foot tank (it attains 6 inches), with medium sized fish as noted in the profile.

The aquarist is one who must learn the ways of the biologist, the chemist, and the veterinarian.[unknown source]

Something we all need to remember: The fish you've acquired was quite happy not being owned by you, minding its own business. If you’re going to take it under your wing then you’re responsible for it. Every aspect of its life is under your control, from water quality and temperature to swimming space. [Nathan Hill in PFK]